Rolled-metal section



A. L. ROBERTS.

ROLLED METAL SECTIONv APPLI CATION FILED NOV. 25,1919.

Patented Dec. 14, 1920 Mg INVENTOR UNITED STATES PATENT OFFICE.

ALVIN L. ROBERTS, OF PHILADELPHIA, PENNSYLVANIA.

ROLLED-METAL SECTIQN.

Application filed November 25, 1919.

T 0 all whom it may concern Be it known that I, ALVIN 'L. Romances, acitizen of the United States, and a resident of Philadelphia, in thecounty of Philadel' phia and State of Pennsylvania, have inventedcertain new and useful Improvements in Rolled-Metal Sections; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to a rolled metal section adapted particularly toform the top and bottom members of a box girder, and it consists in thedetails of construction as will be more fully explained and pointed outin the claims.

The accompanying drawing shows my improvement in cross section and alsoshows in dotted lines a box girder built up from such section.

Box girders are usually formed 01 two web plates spaced a convenientdistance apart, a top plate and a bottom plate, the said plates beingunited in box form by four rolled angles, one at each corner, the saidplates and angles being secured together by riveting. This makes thegirder consist primarily of eight pieces, four plates and four anglesriveted together. Box girders are also constructed with top and bottomplates and four web plates united to the top and bottom plates by anglesas before, but with the web plates made short and lattice bars used toconnect the top and bottom portions of the girder. In such girders theweb plates are shallow and extend but a short distance from the top andthe bottom for the attachment of the lattice bars.

The object of my invention is to simplify Specification of Letterslatent.

Patented Dec. 14, 1920.

Serial No. 340,574.

the construction by reducing the number of parts required in theconstruction of a lattice girder, and also reduce the cost ofmanufacture.

itle my improvement the top and bottom oi the girder are each composedof a single rolled section comprising a web 1, and two right angleflanges 2. The flanges 2 are united to the web at equal distances fromthe side edges of the latter, and the portion 3 of the web projectingout beyond the flange is thicker than the portion or the webintermediate the side flanges. One such rolled section constitutes thetop of a girder and a similar section inverted forms the bottom, asshown by dotted lines in the drawing, the two sections being united bythe plate or lattice bars 4: riveted to the oppositely disposed flanges2 of the two sections.

Having fully described my invention what I claim as new and desire tosecure by Lettors-Patent, is

l. A rolled metal section comprising a web and two integral right angleflanges on the same side o1 the web and removed from the edges thereof,the edges thereof being without flanges or other projections.

2. A rolled section comprising a webland two integral right angleflanges on the same side and removed from the edges of the web, the sideedges of the web which project beyond the flanges being thicker thanthat portion of the web between the flanges and without flanges or otherprojections.

In testimony whereof, I have signed this specification in the presenceof two subscribmg witnesses. I

ALVIN L. ROBERTS. Witnesses Gnonon MARX,

C. C. HARDING.

